J/ApJ/562/446ivo://CDS.VizieR/J/ApJ/562/446doi:10.26093/cds/vizier.15620446CDSRho J.Corcoran M.F.Chu Y.-H.Reach W.T.2007-06-24T22:27:57Z2007-06-24T22:25:03ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frh-ii-regionsx-ray-sourcesyoung-stellar-objectspre-main-sequence-starsThe Trifid Nebula is a young HII region, recently rediscovered as a "pre-Orion" star-forming region, containing protostars undergoing violent mass ejections visible in optical jets as seen in images from the Infrared Space Observatory and the Hubble Space Telescope. We report the first X-ray observations of the Trifid Nebula using ROSAT and ASCA. The ROSAT image shows a dozen X-ray sources, with the brightest X-ray source being the O7 star, HD 164492, which provides most of the ionization in the nebula. We also identify 85 T Tauri star and young, massive star candidates from near-infrared colors using the JHKs color-color diagram from the Two-Micron All-Sky Survey (2MASS). Ten X-ray sources have counterpart near-infrared sources. The 2MASS stars and X-ray sources suggest there are potentially numerous protostars in the young HII region of the Trifid. ASCA moderate-resolution spectroscopy of the brightest source shows hard emission up to 10keV with a clearly detected FeK line.2001ApJ...562..446Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/562/446CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/2mass : The 2MASS database (IPAC/UMass, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/562/446https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/562/446http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/562/446https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/562/446https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/562/446http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/562/446GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/562/446/table2 (2MASS young stellar object and T Tauri star candidates in the Trifid nebula)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/562/446/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/562/446/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/562/446/table2?GETtext/xml+votable180.050000true270.550417-23.07750.005555555555555556Cone search capability for table J/ApJ/562/446/table13 (List of the 12 sources detected in the PSPC Image of the Trifid nebula and infrared counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/562/446/table13?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/562/446/table13?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/562/446/table13?GETtext/xml+votable180.050000true270.72-23.03836110.0055555555555555566/289138.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/562/446?format=asciiX-raydefaultJ/ApJ/562/446/table22MASS young stellar object and T Tauri star candidates in the Trifid nebularecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[RCC2001]Object name (YSO NN or TTS NN)meta.id;meta.mainchar2MASS2MASS designation (1)meta.id.crosschar_RAPosition, from 2MASS source name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS source name (declination part)degpos.eq.dec;meta.mainJ/ApJ/562/446/table13List of the 12 sources detected in the PSPC Image of the Trifid nebula and infrared counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXTRXT designationmeta.id;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainCRCount Ratect/sphot.count;em.X-rayfloate_CRrms uncertainty on CRct/sstat.errorfloatDetDetection (1{sigma})stat.likelihood;obsfloatlogLX? X-ray luminositylog(1e-10W.m**-2)phys.luminosity;em.X-rayfloatnullableNote[ab] Individual notes (1)meta.notecharTypeType of the 2MASS counterparts (2)src.classchardproj? Projected distance between the X-ray and 2MASS sourcesarcsecpos.angDistancefloatnullableRA2? 2MASS counterpart right ascension (J2000)meta.id.assoc;pos.eq.ranullableDE2? 2MASS counterpart declination (J2000)meta.id.assoc;pos.eq.decnullableJmag? 2MASS counterpart J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS counterpart H magnitudemagphot.mag;em.IR.HfloatnullableKsmag? 2MASS counterpart Ks magnitudemagphot.mag;em.IR.KfloatnullableComComments (3)meta.note2MASSShow 2MASS sources from table2meta.ref.urlchar